am2884 pit standard - southeastwater.com.au

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"THIS DOCUMENT IS AND SHALLREMAIN THE PROPERTY OF SOUTHEAST WATER. THIS DOCUMENT MAYONLY BE USED FOR THE PURPOSEFOR WHICH IT WAS COMMISSIONEDAND IN ACCORDANCE WITH THETERMS OF ENGAGEMENT FOR THECOMMISSION. THIS DESIGN SHOULDNOT BE COPIED OR AMENDEDWITHOUT WRITTEN PERMISSION FROMSOUTH EAST WATER. UNAUTHORISEDUSE OF THIS DOCUMENT IN ANY WAYIS PROHIBITED."

COPYRIGHT

JOB NoDESCRIPTION

101 Wells Street, Frankston, VIC 3199 W : www.sew.com.au

T : 61 3 9552 3000 F : 61 3 9552 3001 E : [email protected]

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SHEET SIZE: A1

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SOUTH EAST WATER

AM2884- PIT STANDARD

PRINCIPLES AND REQUIREMENTS

.

AM2884- SHEET 1 A

AS SHOWN

NA

NA

R. JAGGER

OCT 21

R. JAGGER

OCT 21

M. LOWE

OCT 21

J. STREET

OCT 21

.C. PAXMAN

J. TULLY

OCT 21

C. PAXMAN

OCT 21

A ISSUED FOR DISCUSSION. JUN 21

B PUBLISHED FIRST VERSION. OCT 21

TABLE 5: KEY PRINCIPLES AFFECTING PIT DESIGN DECISIONSPRIORITY PRINCIPLE PREFERENCE/ LIMITATION

TABLE 2: TYPICAL EQUIPMENT LOCATIONSEQUIPMENT

SUB-TYPE

TYPICALLY

OFFSET

TYPICALLY IN-LINE PLACEMENT PREFERENCE REFERENCE

TABLE 6: PIT LOCATION & ACCESS PREFERENCEPREFERENCE PIT LOCATION

NOTES REGARDING TABLE 6:

TABLE 3: PIT FEATURESFEATURE GUIDANCE OPENING SIZE REFERENCE

TABLE 4: PIT FABRICATION OPTIONSOPTION TYPICAL SITUATIONS OF USE RELEVANT STANDARDS

BOUYANCY:·

·

STRUCTURAL:

BACKFILL:

EMBEDMENT:

SEWAGE PUMP STATION VALVE PITS:

PIPE SUPPORTS:

COVERS AND CONCRETE APRONS:

AIR VALVE PITS:

LIGHTING:

TABLE 1: ALTERNATIVES TO ENTRY PITSOPTION ALTERNATIVE OPTION TYPICAL SITUATIONS OF USE RISKS THAT WOULD REQUIRE MITIGATION

·

·

·

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CAD FILE NAME:

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1

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PREVENT FALLS

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WORKSAFE VICTORIA COMPLIANCE CODE - PREVENTION OF FALLS IN GENERAL CONSTRUCTION. REFER SOUTH EAST WATER DOC AM2757: COVERS FOR UNDERGROUND CHAMBERS.

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MINIMISE CONFINED SPACE RISK AS FAR AS PRACTICAL. LIMIT NEED FOR CONFINED SPACE ENTRY

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CONFINED SPACE ENTRY ASSESSMENT SHALL BE DONE FOR ALL PITS IN ACCORDANCE WITH SOUTH EAST WATER REQUIREMENTS. WHERE A PIT IS A CONFINED SPACE, MAXIMISE EASE OF ACCESS, EGRESS AND RESCUE

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2

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MINIMISE RISK OF SEWAGE SPILLS

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PREVENT AND CONTAIN SEWAGE DISCHARGES AS MUCH AS PRACTICAL

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3

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ENSURE STRUCTURALLY SOUND

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REFER MRWA-S-307 to 310 FOR CIRCULAR PITS, AS3600 AND SHEET 3 FOR THRUST RESTRAINT

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4

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PROVIDE ACCESS FOR OPERATION AND MAINTENANCE

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PROVIDE SAFE ACCESS TO ALL AREAS OF THE PIT REQUIRING ACCESS. REFER SHEET 4

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5

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PROTECT THE ASSET

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LOCATE AS PER TABLE 6. COMPLY WITH AM2757: COVERS FOR UNDERGROUND STRUCTURES AND AM2759: FACILITY SECURITY SPECIFICATION

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6

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MAINTAIN CLEARANCES FROM OTHER SERVICES AND STRUCTURES

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REFER MRWA SEWER CODE SECTION 5.4 AND MRWA WATER CODE SECTION 5.12.5.2

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7

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PROVIDE ADEQUATE CLEARANCES WITHIN THE PIT

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IN CONSIDERATION OF THE LIKELY TOOLS REQUIRED (eg: TORQUE WRENCHES), PROVIDE SUFFICIENT FREE SPACE AROUND ALL FASTENERS. REFER TABLE B AND TABLE C ON SHEET 4

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8

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MINIMISE DEPTH OF PITS

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WHERE PRACTICABLE, DEPTH OF PIT SHOULD BE <1.5m TO REDUCE COST AND REDUCE FALLING AND CONFINED SPACE RISKS.

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9

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ENSURE MAINTAINABLE ITEMS REMOVABLE

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ENSURE ADEQUATE OPENING ABOVE MAINTAINABLE ITEMS. REFER TABLE B ON SHEET 4

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10

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ENSURE CORRECT ALIGNMENT OF PIPELINE COMPONENTS

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PIPELINE ASSEMBLY MUST BE FULLY BOLTED TOGETHER BEFORE BEING SECURED TO PIT

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# OFFSET APPURTENANCES MAY BE OFFSET VERTICALLY OVER AND/OR TO THE SIDE OF THE MAIN. WHERE LOCATED OVER THE MAIN, THE PIT NEED ONLY ENCAPSULATE THE APPURTENANCE (NOT THE MAIN, UNLESS OTHERWISE SPECIFIED).

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VALVE

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WATER AIR VALVE

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VERTICAL &/OR HORIZONTAL #

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OFFSET NON-ENTRY PIT OR ABOVE GROUND

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MRWA-W-304 & 305

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SEWERAGE AIR VALVE

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OVER MAIN ENTRY PIT

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AM2883

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NON-DRINKING WATER CROSS CONNECTION VALVES

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YES

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ABOVE GROUND CAGE

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DUAL WATER INTERCONNECTION DRAWING 2

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ISOLATION VALVE (BURIED )5 )

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YES

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BURIED

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MRWA-W-302

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ISOLATION VALVE (IN PIT )5 )

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YES

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INLINE ENTRY PIT

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SHEETS 2 to 5

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NON-RETURN VALVE (LOW RISK )4 )

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YES

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BURIED

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MRWA-W-204 to 206

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NON-RETURN VALVE (NOT LOW RISK )4 )

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YES

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INLINE ENTRY PIT

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SHEETS 2 to 5

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CONTROL VALVE (EG: PRV)

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YES

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INLINE ENTRY PIT

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SHEETS 2 to 5

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FLOW METER

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FLOW METER (LOWER RISK)

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YES

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BURIED

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AM2832

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FLOW METER (HIGHER RISK)

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YES

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INLINE ENTRY PIT

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SHEETS 2 to 5

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FLUSHING POINT

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VALVE-CONTROLLED HYDRANT

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OFFSET NON-ENTRY PIT

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MRWA-W-304 & 305

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END OF LINE WASHOUT

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YES

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INLINE NON-ENTRY PIT

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MRWA-W-109 & 205

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TANKER CONNECTION POINT

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OFFSET NON-ENTRY PIT

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MRWA-W-307

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1

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SOUTH EAST WATER-OWNED LAND

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2

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PUBLIC OPEN SPACE

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3

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NATURE STRIP / MEDIAN STRIP / ROAD SHOULDER

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4

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< 3m OF KERB IN NO PARKING LOCATION UNDER ROAD PAVEMENT (REQUIRES SEW APPROVAL).

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5

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>3m FROM KERB OR IN A PARKING LOCATION UNDER ROAD PAVEMENT (REQUIRES SEW APPROVAL).

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a. WHERE ITEMS CANNOT BE MANUALLY LIFTED, PIT LOCATION REQUIRES ACCESS BY WHERE ITEMS CANNOT BE MANUALLY LIFTED, PIT LOCATION REQUIRES ACCESS BY A CRANE TRUCK IN ACCORDANCE WITH SOUTH EAST WATER FACILITY ACCESS STANDARD AM2761. b. WHERE POSSIBLE, LOCATE PITS OUT OF ROADWAY TO ENSURE SAFE ACCESS AND WHERE POSSIBLE, LOCATE PITS OUT OF ROADWAY TO ENSURE SAFE ACCESS AND MINIMISE TRAFFIC DISRUPTION DURING MAINTENNACE. c. LOCATE PITS TO PROVIDE CLEAR SPACE FOR ANY LIKELY FUTURE EXPANSION. LOCATE PITS TO PROVIDE CLEAR SPACE FOR ANY LIKELY FUTURE EXPANSION. d. FOR EXAMPLES OF PREFERRED LOCATIONS TO LOCATE PITS IN THE ROAD RESERVE, FOR EXAMPLES OF PREFERRED LOCATIONS TO LOCATE PITS IN THE ROAD RESERVE, REFER SHEET 2 OF AM2883- SEWAGE AIR VALVE STANDARD.

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A

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ENTRY/ NON-ENTRY

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SMALL SHALLOW ITEMS WHICH CAN BE ACCESSED FROM GROUND LEVEL GENERALLY NON ENTRY (E.G. WASHOUTS, HYDRANTS AND WATER AIR VALVES).

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NON-ENTRY OPENINGS SAME AS PIT FOOTPRINT

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MRWA-W-305

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B

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LADDER

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LADDER REQUIRED FOR ENTRY PITS >600 DEEP. WHERE STANDARD STANCHIONS DO NOT FIT WITHIN A SHALLOW PIT, FIT ABOVE GROUND PERMANENT STANCHIONS. WHERE THIS IS NOT PRACTICAL, IMPLEMENT A BESPOKE SOLUTION (eg: FOLDABLE OR MULTIPART STANCHIONS). LOCATE LADDER SUCH THAT ONLY ONE COVER NEEDS TO BE OPENED TO GAIN ACCESS

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NA

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SEWL-STD-005

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C

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VENTILATION

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AIR VALVE PITS REQUIRE VENTILATION

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NA

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SHEET 1 NOTES

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D

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PENETRATIONS

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PIPE PENETRATIONS VARY DEPENDING ON PIPE TYPE AND THRUST

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NA

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SHEET 3

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E

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DRAINAGE

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PITS SHALL BE DESIGNED ASSUMING THAT LEAKAGE & INFILTRATION WILL OCCUR

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NA

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SHEET 2

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F

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DISMANTLING

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DISMANTLING JOINT REQUIRED ADJACENT TO EACH HIGH MAINTENANCE ITEM. TYPICALLY FLANGE ADAPTORS, RESTRAINED OR UNRESTRAINED FLANGE ADAPTORS USED

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NA

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SEW APPROVED PRODUCTS

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G

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LIGHTING

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REQUIRED WHEN MAINS POWER AVAILABLE AND PIT FOOTPRINT > 3 m²

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NA

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SHEET 1 NOTES

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H

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SPINDLES

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PIT ISOLATION VALVE SPINDLES SHALL RISE TO AND BE OPERABLE FROM SURFACE

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NA

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AM2757

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I

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COVERS

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COVERS, SURFACE FEATURES AND FALL PROTECTION AS PER SEW STANDARD

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PITS < 2.0m FLOOR TO CEILING, OPENING AND PIT FOOTPRINT SAME. PITS >2.0m FLOOR TO >2.0m FLOOR TO 2.0m FLOOR TO CEILING MAY HAVE A FIXED CEILING, PROVIDED THE OPENING FOOTPRINT ENCOMPASSES THE FOOTPRINT OF ALL LADDER WORKING SPACES AND HIGH MAINTENANCE EQUIPMENT

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AM2757

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J

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SHAPE

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SINGLE PIPELINE APPERTANACES OFTEN COST EFFECTIVELY CONTAINED WITH CIRCULAR STRUCTURES, ESPECIALLY FOR DEEPER ITEMS

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MRWA-S-307 TO 313 FOR CIRCULAR PITS

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APPERTANACES ON 2 PIPELINES TYPICALLY BETTER CONTAINED WITH RECTANGULAR STRUCTURES> 2 PIPELINES TYPICALLY BETTER CONTAINED WITH RECTANGULAR STRUCTURES

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SHEET 5

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K

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ACCESS TO BOTH SIDES OF PIT EQUIPMENT (ACCESS REQUIRED TO ALL DISMANTLING JOINT FASTENERS)

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ACCESS FROM ONE SIDE WHERE BOTH SIDES OF ITEMS ARE ACCESSIBLE FROM ONE SIDE. TYPICALLY SUITABLE FOR ITEMS ON MAINS<DN300.<DN300.DN300.

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NO EXAMPLE SHOWN

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ACCESS ITEMS BY GOING OVER PIPE (I.E: STRADDLE PIPE IF TOP OF PIPE <600 FROM STANDING LEVEL (STEP OR FLOOR)). TYPICALLY SUITABLE FOR ITEMS ON MAINS DN600< DN600

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FIGURES 1 to 3, SHEET 5

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ACCESS ITEMS FROM MULTIPLE LADDERS. TYPICALLY SUITABLE FOR ITEMS ON MAINS >DN375>DN375DN375

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FIGURE 4, SHEET 5

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ACCESS ITEMS BY GOING UNDER PIPE (ie: CRAWL WAY). NOT TYPICALLY ACCEPTABLE. SEW APPROVAL REQUIRED. POSSIBLY SUITABLE FOR ITEMS ON MAINS >DN375>DN375DN375

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NO EXAMPLE SHOWN

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ACCESS ITEMS FROM STAIRCASE OVER MAIN(S). POSSIBLY SUITABLE FOR ITEMS ON MAINS >DN375. >DN375. DN375. NOT TYPICALLY ACCEPTABLE. SEW APPROVAL REQUIRED

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NO EXAMPLE SHOWM

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CAST IN-SITU CONCRETE

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NEW PITS CONSTRUCTED OVER EXISTING MAINS. NON STANDARD AND LARGER PITS

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AM2882 - SEW CONCRETE STANDARD

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PRECAST CONCRETE or PREFABRICATED FRP

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RECTANGULAR SMALLER PITS

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WSA PS - 323 (CONC). BS 4994 (FRP)

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PRECAST CONCRETE OR PLASTIC CIRCULAR SHAFT

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TYPICALLY OFFLINE OR SINGLE APPERTANACES

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WSA PS - 323 (CONC). WSA 137 (PLASTIC)

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ASSUME GROUND WATER AT SURFACE LEVEL UNLESS IT CAN BE DEMONSTRATED THAT A DIFFERENT LEVEL IS APPROPRIATE. CYLINDRICAL PIT BUOYANCY MITIGATION AS PER MRWA-S-307 TABLE 307-B. A. PITS SHALL BE DESIGNED AS WATER RETAINING STRUCTURES. PITS SHALL BE DESIGNED AS WATER RETAINING STRUCTURES. B. PREFABRICATED PITS SHALL BE STRUCTURALLY DESIGNED BY PIT SUPPLIER, PREFABRICATED PITS SHALL BE STRUCTURALLY DESIGNED BY PIT SUPPLIER, ENSURING THAT THE PIT DESIGN IS SUITABLE FOR THE GROUND CONDITIONS. C. CAST INSITU PITS REQUIRE STRUCTURAL DESIGN BY THE DESIGNER. CAST INSITU PITS REQUIRE STRUCTURAL DESIGN BY THE DESIGNER. D. ALL PITS REQUIRE STRUCTURAL REINFORCEMENT UNLESS PIT IS CYLINDRICAL, BUILT ALL PITS REQUIRE STRUCTURAL REINFORCEMENT UNLESS PIT IS CYLINDRICAL, BUILT TO MRWA MAINTENANCE HOLE STANDARDS AND NOT INVOLVED IN THRUST RESTRAINT. E. THE PIT AND ALL PIPELINE PENETRATION DETAILS SHALL BE DESIGNED TO THE PIT AND ALL PIPELINE PENETRATION DETAILS SHALL BE DESIGNED TO ACCOMMODATE ANY HYDRAULIC THRUST ACTING ON THE PIPELINE. F. CONCRETE PITS, WALLS AND CEILING SHALL BE MINIMUM 150 THICK WITH MINIMUM SL81 CONCRETE PITS, WALLS AND CEILING SHALL BE MINIMUM 150 THICK WITH MINIMUM SL81 REINFORCEMENT. THE AREA AROUND THE PIT IS TO BE BACKFILLED WITH GRANULAR BACKFILL, AS PER MRWA BACKFILL SPECIFICATION. THIS MAY BE CEMENT STABILISED IF APPROPRIATE (COMPACTION DENSITY DIFFICULT TO ACHIEVE). A. PIPELINE EMBEDMENT ADJACENT TO PIT SHALL CONFORM TO PIPELINE EMBEDMENT PIPELINE EMBEDMENT ADJACENT TO PIT SHALL CONFORM TO PIPELINE EMBEDMENT STANDARDS (MRWA-S-202 & MRWA-W-203. OVER-EXCAVATION SHALL BE FILLED WITH CEMENT STABILISED EMBEDMENT OR CONCRETE. B. CAST INSITU PITS SHOULD BE PLACED ON NATIVE SOIL. CAST INSITU PITS SHOULD BE PLACED ON NATIVE SOIL. C. PREFABRICATED PITS SHOULD BE PLACED ON: PREFABRICATED PITS SHOULD BE PLACED ON: C.A. PITS WITH FOOTPRINT < 4m²: CEMENT STABILISED CRUSHED ROCK (CLASS 4) PITS WITH FOOTPRINT < 4m²: CEMENT STABILISED CRUSHED ROCK (CLASS 4) C.B. PITS WITH FOOTPRINT 4m²: > 100 THICK BLINDING CONCRETE. PITS WITH FOOTPRINT 4m²: > 100 THICK BLINDING CONCRETE. > 4m²: > 100 THICK BLINDING CONCRETE. REFER TO SOUTH EAST WATER SUPPLEMENT TO WSA04 FOR ADDITIONAL REQUIREMENTS OF SEWAGE PUMP STATION VALVE PITS. A. IF ANY COMPONENT WITHIN THE PIT IS REMOVED, ALL REMAINING COMPONENTS IF ANY COMPONENT WITHIN THE PIT IS REMOVED, ALL REMAINING COMPONENTS SHOULD REMAIN SECURELY IN POSITION. B. FABRICATED STAINLESS STEEL (SS) SUPPORTS PREFERRED. ENSURE COMPLIANCE FABRICATED STAINLESS STEEL (SS) SUPPORTS PREFERRED. ENSURE COMPLIANCE WITH STANDARDS AM2760: STAINLESS STEEL SPECIFICATION. C. ON REQUEST, THE DESIGNER SHALL PROVIDE STRUCTURAL VERIFICATION OF THE PIPE ON REQUEST, THE DESIGNER SHALL PROVIDE STRUCTURAL VERIFICATION OF THE PIPE SUPPORTS. A. PIT COVER(S) AND SURFACE CONCRETE APRONS SHOULD BE IN ACCORDANCE WITH PIT COVER(S) AND SURFACE CONCRETE APRONS SHOULD BE IN ACCORDANCE WITH SOUTH EAST WATER STANDARD AM2757: COVERS FOR UNDERGROUND CHAMBERS. B. WHERE COVER SUPPORT BEAMS ARE REQUIRED: WHERE COVER SUPPORT BEAMS ARE REQUIRED: B.A. THEY SHALL BE LOCATED SUCH THAT HIGH MAINTENANCE EQUIPMENT CAN BE THEY SHALL BE LOCATED SUCH THAT HIGH MAINTENANCE EQUIPMENT CAN BE REMOVED FROM THE PIT WHILE THE BEAM(S) REMAIN IN PLACE. B.B. THE DEPTH FROM FLOOR OR STEP TO UNDERNEATH OF BEAMS SHALL BE 2m. THE DEPTH FROM FLOOR OR STEP TO UNDERNEATH OF BEAMS SHALL BE 2m. > 2m. A. AIR VALVE PITS WILL REQUIRE VENTILATION. AIR VALVE PITS WILL REQUIRE VENTILATION. B. FOR WATER SUPPLY AIR VALVE DESIGN, REFER MRWA-W-305 FOR WATER SUPPLY AIR VALVE DESIGN, REFER MRWA-W-305 C. FOR SEWAGE PRESSURE MAIN AIR VALVE INSTALLATION DESIGN, REFER SEW FOR SEWAGE PRESSURE MAIN AIR VALVE INSTALLATION DESIGN, REFER SEW STANDARD AM2883. A. PROVIDE LIGHTING WHERE ALL OF THE FOLLOWING CONDITIONS EXIST: PROVIDE LIGHTING WHERE ALL OF THE FOLLOWING CONDITIONS EXIST: A.A. MAINS POWER IS ALREADY AVAILABLE ON SITE, AND MAINS POWER IS ALREADY AVAILABLE ON SITE, AND A.B. THE PIT HAS A FOOTPRINT > 3 m² THE PIT HAS A FOOTPRINT > 3 m² B. PROVIDE 10 W OF WHITE LED LIGHTING PER m² OF PIT FOOTPRINT. PROVIDE 10 W OF WHITE LED LIGHTING PER m² OF PIT FOOTPRINT. C. PLACE LIGHTING CENTRALLY ON AT LEAST TWO OPPOSITE WALLS AT 1.8m ABOVE PLACE LIGHTING CENTRALLY ON AT LEAST TWO OPPOSITE WALLS AT 1.8m ABOVE FLOOR LEVEL.

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1

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LOCALLY BRINGING THE PIPE ABOVE GROUND

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WITHIN A SECURE FACILITY, PUBLIC OPEN SPACE OR LOW RISK OF TRAFFIC COLLIKSION

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NOISE, ODOUR, VEHICLE COLLISION, VANDALISM AND HYDRAULIC (EG: AIR ACCUMULATION). WHERE INVERTED "U" SHAPE PIPE USED, INSTALL AIR VALVE AT HIGH POINT AND ENSURE AIR VALVE DOES NOT CAUSE A TRANSIENT HYDRAULIC ISSUE.

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2

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SELECT OR MODIFY EQUIPMENT SO IT IS SUITABLE FOR BURIED SERVICE

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LOWER RISK OF FAILURE ITEMS OR 4 OR OR WHERE BURYING IS PREFERRED 5

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PROTECT ELECTRICAL ITEMS FROM MOISTURE INGRESS. SELECT NON-RETURN VALVES WITHOUT EXTERNAL MOVING PARTS (NO COUNTER WEIGHT ARMS) etc. DAMAGE TO OTHER ASSETS DURING EXCAVATION AND TRAFFIC RISKS

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1. PITS TYPICALLY REQUIRED FOR "HIGH MAINTENANCE EQUIPMENT" (REFER TABLE 2) WHEN REGULAR ACCESS IS NEEDED TO EQUIPMENT SITUATED BELOW GROUND. PITS TYPICALLY REQUIRED FOR "HIGH MAINTENANCE EQUIPMENT" (REFER TABLE 2) WHEN REGULAR ACCESS IS NEEDED TO EQUIPMENT SITUATED BELOW GROUND. 2. PITS ARE OFTEN CLASSIFIED AS CONFINED SPACES. CONFINED SPACES SHOULD BE AVOIDED WHEREVER PRACTICAL UNLESS OTHERWISE STATED IN RELATED STANDARDS. PITS ARE OFTEN CLASSIFIED AS CONFINED SPACES. CONFINED SPACES SHOULD BE AVOIDED WHEREVER PRACTICAL UNLESS OTHERWISE STATED IN RELATED STANDARDS. 3. FOR DEFINITION OF LOW TRAFFIC COLLISION RISK, REFER SHEET 2 OF OF AM2883-AIR VALVE STANDARD. FOR DEFINITION OF LOW TRAFFIC COLLISION RISK, REFER SHEET 2 OF OF AM2883-AIR VALVE STANDARD. LOW TRAFFIC COLLISION RISK, REFER SHEET 2 OF OF AM2883-AIR VALVE STANDARD. , REFER SHEET 2 OF OF AM2883-AIR VALVE STANDARD. 4. LOW RISK OF FAILURE ITEMS INCLUDE: LOW RISK OF FAILURE ITEMS INCLUDE: INCLUDE: 4.1. DN225 WATER SUPPLY APPURTENANCES DN225 WATER SUPPLY APPURTENANCES < DN225 WATER SUPPLY APPURTENANCES 4.2. DN150 PRESSURE SEWER RETICULATION APPURTENANCES DN150 PRESSURE SEWER RETICULATION APPURTENANCES < DN150 PRESSURE SEWER RETICULATION APPURTENANCES ALL OTHER APPURTENANCES INCLUDING SPS PRESSURE MAIN APPURTENANCES ARE NOT CONSIDERED TO BE LOW RISK (ie: SHOULD NOT BE DIRECT BURIED). 5. ISOLATION VALVES ARE TYPICALLY PREFERRED IN PITS WHEN: ISOLATION VALVES ARE TYPICALLY PREFERRED IN PITS WHEN: VALVES ARE TYPICALLY PREFERRED IN PITS WHEN: VALVES ARE TYPICALLY PREFERRED IN PITS WHEN: ARE TYPICALLY PREFERRED IN PITS WHEN: IN PITS WHEN: WHEN: THE VALVE IS i) NOT LOW RISK , AND ii) HAS A GEARBOX , AND ONE OF iii) OR iv) BELOW NOT LOW RISK , AND ii) HAS A GEARBOX , AND ONE OF iii) OR iv) BELOW LOW RISK , AND ii) HAS A GEARBOX , AND ONE OF iii) OR iv) BELOW 4 , AND ii) HAS A GEARBOX , AND ONE OF iii) OR iv) BELOW iii) EXCAVATION IS NOT PRACTICAL (ie: MINIMUM CLEARANCE FROM THE OUTSIDE OF THE VALVE BODY IS NOT ACHIEVABLE), OR EXCAVATION IS NOT PRACTICAL (ie: MINIMUM CLEARANCE FROM THE OUTSIDE OF THE VALVE BODY IS NOT ACHIEVABLE), OR NOT ACHIEVABLE), OR ACHIEVABLE), OR iv) IS WITHIN MAJOR ROAD PAVEMENT AND NOT WITHIN 3m OF KERB.

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COPYRIGHT

JOB NoDESCRIPTION



MELWAY REF:

DATUM:

SHEET SIZE: A1

DES.

REVIEW

PM.

APP'D

DATE

SOUTH EAST WATER


PIT DRAINAGE

NA

AM2884- SHEET 2 B

AS SHOWN

NA

NA

.

.

.

.

A ISSUED FOR DISCUSSION. JUN 21

.

DRAINAGE:

FIGURE 2A: DRAIN TO SEWAGE WET WELL OR MAINTENANCE STRUCTUREFIGURE 1A: DRAIN TO STORM WATER PIT

WATEROPTIONS SHOWN IN ORDER OF PREFERENCE

SEWAGEOPTIONS SHOWN IN ORDER OF PREFERENCE

DETAILS

FIGURE 1B: DRAIN TO STORM WATER PIPEWHEN DRAINAGE SYSTEM IS LOWER THAN PIT FLOOR

DETAIL A: SUMP WITH WAFER CHECK VALVE AND WATER SEAL

FIGURE 1C: DRAIN TO NATIVE COHESIONLESS SOIL

FIGURE 1E: SUMP COLLECTION (EDUCTION OR MANUAL PUMP OUT)

FIGURE 1D: SUMP PUMP TO STORM WATER PIT (PREFERRED) OR STORM WATER DRAINMAY BE NECESSARY WHEN DRAINAGE SYSTEM IS HIGHER THAN PIT FLOOR

FIGURE 2C: SUMP COLLECTION (EDUCTION OR MANUAL PUMP OUT)

FIGURE 2B: DRAIN TO SEWER MAIN

DETAIL B: SUMP WITH PERMANENT SUMP PUMP

R. JAGGER

OCT 21

R. JAGGER

OCT 21

OCT 21PUBLISHED FIRST VERSION

B

M. LOWE

C. PAXMAN

J. STREETJ. TULLY

C. PAXMAN

FIGURE 2D: SUMP PUMP TO MAINTENANCE STRUCTURE (PREFERRED) OR SEWER MAINMAY BE NECESSARY WHEN SEWERAGE SYSTEM IS HIGHER THAN PIT FLOOR

OCT 21

OCT 21 OCT 21

OCT 21

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CAD FILE NAME:

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SEWAGE WET WELL or MAINTENANCE STRUCTURE

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RUBBER DUCKBILL NON-RETURN VALVE

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1. SELECT THE HIGHER ORDER DRAINAGE OPTION UNLESS THIS IS IMPRACTICAL. AN OPTION IS CONSIDERED IMPRACTICAL IF: SELECT THE HIGHER ORDER DRAINAGE OPTION UNLESS THIS IS IMPRACTICAL. AN OPTION IS CONSIDERED IMPRACTICAL IF: 1.1. THE PREFERRED RECEIVING STRUCTURE IS > 20m AWAY AND THE PIT CONTAINS AN AIR VALVE OR SURGE THE PREFERRED RECEIVING STRUCTURE IS > 20m AWAY AND THE PIT CONTAINS AN AIR VALVE OR SURGE ANTICIPATION VALVE. 1.2. THE PREFERRED RECEIVING STRUCTURE IS OTHERWISE > 5m AWAY. THE PREFERRED RECEIVING STRUCTURE IS OTHERWISE > 5m AWAY. 2. GROUND SHALL GRADE AWAY FROM THE PIT (50mm ABOVE SURROUNDING AREA) WITH SURFACE AT A MINIMUM 1:100 GROUND SHALL GRADE AWAY FROM THE PIT (50mm ABOVE SURROUNDING AREA) WITH SURFACE AT A MINIMUM 1:100 GRADE WHERE PRACTICAL. 3. THE FLOOR OF THE PIT SHALL BE GRADED AT 1 in 50 TO THE SUMP. THE FLOOR OF THE PIT SHALL BE GRADED AT 1 in 50 TO THE SUMP. 4. DRAINAGE PIPE SHALL BE DN50, DESIGNED AND CONSTRUCTED IN ACCORDANCE WITH DN100 DWV MRWA PROPERTY DRAINAGE PIPE SHALL BE DN50, DESIGNED AND CONSTRUCTED IN ACCORDANCE WITH DN100 DWV MRWA PROPERTY SERVICE SEWERAGE STANDARDS. 5. ALL PIT SUMPS SHALL BE MINIMUM 400 X 400 X 400 WITH GRATED COVER AT FLOOR LEVEL. ALL PIT SUMPS SHALL BE MINIMUM 400 X 400 X 400 WITH GRATED COVER AT FLOOR LEVEL. GRATE SHALL BE GALVANISED IF WATER PIT AND 316 STAINLESS STEEL IF SEWAGE PIT. 6. ALL NON-RETURN VALVES SHALL BE MOUNTED SO THEY ARE NORMALLY CLOSED.ALL NON-RETURN VALVES SHALL BE MOUNTED SO THEY ARE NORMALLY CLOSED.

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STORM WATER PIT

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1 in 50 GRADE TO SUMP

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GROUND SHALL GRADE AWAY FROM PIT COVER AT MIN. 1:100 GRADE

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GRADE AT 1:60

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CONNECT TO DRAINAGE SYSTEM IN ACCORDANCE WITH DRAINAGE AUTHORITY REQUIREMENTS AND MRWA-S-406

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SS316 BACKING RING

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DN50 PVC-U PRESSURE PIPE

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DN50 DWV WATERSEAL

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DN50 316SS WAFER CHECK VALVE

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DN50 SHEAR BANDED COUPLING

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DN50 PVC-U SCJ STUB FLANGE

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PIT STRUCTURE

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>400

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>400

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REMOVABLE SUMP GRATE

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CONCRETE FOUNDATIONS FOR PIT AND PIPE SUPPORT

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LOW WATER TABLE NATIVE COHESSIONLESS SOIL

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20mm SINGLE SIZE AGGREGATE ( 100 THICK)> 100 THICK)

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ENSURE OPENING PROVIDED ABOVE SUMP

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GRADE AT 1:60

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CONNECTION TO SEWER AS PER 300 SERIES MRWA GRAVITY SEWERAGE STANDARDS

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DN50 X DN100 REDUCER

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DN50 X DN100 REDUCER

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SELECT ONE OF STORM WATER PIT OR DRAIN

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PLAIN SS316 BACKING RING, TAPPED TO JOINT WITH METAL THREAD SCREWS

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SS316 M6 METAL THREAD SCREWS (X4)

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100

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CLIPSAL 56 SERIES SINGLE SWITCHED SOCKET OUTLET AND IP66 STRAIGHT PLUG FOR POWER SUPPLY TO PUMP. LOCATE AS CLOSE TO GROUND LEVEL AS PRACTICAL

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DN63PE PN8 PE100 PIPE

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COMPO (REFER MRWA-S-500, TABLE 500-B)

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> PN8 (150 PSI RATED) DN50 POLYESTER REINFORCED PVC FLEXIBLE LAYFLAT HOSE (TO ENABLE THE PUMP TO BE RAISED TO SURFACE WHILE PUMP REMAINS CONNECTED). SELECT UV RESISTANT HOSE IF PIT UNCOVERED.

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GRINDEX TETRA LINE "MICRO" ELECTRICAL SUBMERSIBLE DRAINAGE PUMP

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90 BEND PE PIPE COMPRESSION FITTING

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DETAIL B

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SS316 M10 LIFTING EYEBOLT FASTENED TO PIT STRUCUTRE

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6mm NYLON HAUL LINE BETWEEN PUMP AND EYEBOLT WITH 2m ADDITIONAL LENGTH

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>400

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>400

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CONNECT TO SEWER DN150 OR LARGER

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CAMLOCK COUPLING

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IS COVER AND FRAME AS PER MRWA-S-301

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DN100 DWV RISER

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DN100 x DN50 REDUCER

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DETAIL A

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DETAIL A

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>150

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CONNECT TO DRAINAGE SYSTEM IN ACCORDANCE WITH DRAINAGE AUTHORITY REQUIREMENTS AND MRWA-S-406

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> MIN COVER (REFER MRWA-W-202)

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DN50 BSP NON RETURN VALVE. PHILMAC OR APPROVED EQUIVALENT

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DETAIL A

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DETAIL B

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SELECT ONE OF MAINTENANCE STRUCTURE OR SEWER MAIN

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CONNECTION TO SEWER AS PER 300 SERIES MRWA GRAVITY SEWERAGE STANDARDS

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LEVEL MONITORING SHALL BE INSTALLED. CONTACT SEW SEWAGE OPERATIONS TO ARRANGE FOR INSTALLATION OF THIS EQUIPMENT

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MELWAY REF:

DATUM:

SHEET SIZE: A1

DES.

REVIEW

PM.

APP'D

DATE

SOUTH EAST WATER


PIT FOUNDATION, PIPE PENETRATIONS

AND THRUST CONTROL

NA

AM2884- SHEET 3 B

AS SHOWN

NA

NA

.

.

.

.

A ISSUED FOR DISCUSSION.

.

THRUST CONTROL:·

·

·

·

·

FIGURE 3: EXTERNAL THRUST RESTRAINT (SECTION A)

FIGURE 1: PIT PLAN

A

FIGURE 4: CAST IN SITU END WALL RESTRAINT (SECTION A)

PUBLISHED FIRST VERSION

B

PIPE FLEXIBILITY ADJACENT TO PIT ENTRY POINTS:·

·

FIGURE 2: EXTERNAL THRUST RESTRAINT (SECTION A)

FIGURE 5: PRECAST END WALL THRUST RESTRAINT FIGURE 6: NON-PRESSURE or AIR PIPELINE WHICH IS NOT PE.

R. JAGGER

OCT 21

R. JAGGER

OCT 21

OCT 21

M. LOWE

C. PAXMAN

J. STREETJ. TULLY

C. PAXMAN

OCT 21

OCT 21OCT 21

OCT 21

JUN 21

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CAD FILE NAME:

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PIPELINE REQUIRES RESTRAINT WHERE PIT CONTAINS A PRV, NRV, ISOLATION VALVE OR A PE PIPE CONNECTS TO THE PIT. FITTINGS EXTERNAL TO THE PIT (eg: ISOLATION VALVE) MAY OR MAY NOT BE PROTECTED USING THESE FIGURES. THIS WOULD NEED TO BE SEPARATELY ASSESSED AND WOULD DEPEND ON THE FITTING TYPE, ITS LOCATION AND JOINT TYPE. THE THRUST CONTROL ARRANGEMENTS SHOWN MAY NEED TO BE DUPLICATED ON BOTH SIDES OF THE PIT WHERE THRUST MAY BE PRESENT ON BOTH SIDES. CALCULATE THRUST AREA REQUIRED AS PER MRWA-W-204 & MRWA-W-205-A. THE STRUCTURAL DESIGN OF PIT SHALL TAKE INTO ACCOUNT THE THRUST WHICH WILL BE TRANSFERRED TO THE PIT WALL BY THE PIPELINE.

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PUDDLE FLANGE

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2mm HYDROPHILIC RUBBER BANDAGE AROUND PIPE

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BACKFILL

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PUDDLE FLANGE

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CONCRETE RESTRAINT REQUIRED WHERE PIT END WALL AREA < MINIMUM THRUST AREA

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PIT END WALL AREA MAY COUNT TOWARDS THRUST CONTROL. ASSUME AHBP = 50 kPa.

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REFER MRWA-W-306B FIG. 306B-B FOR PUDDLE FLANGE DETAIL, OR MRWA-W-306A FIG 306A-E IF PE PIPE.

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REFER MRWA-W-205A FIG. 205A-H AND TABLE 205A-B FOR DESIGN, CONSTRUCTION & REINFORCEMENT DETAILS.

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VALVE

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VALVE

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ISOLATION VALVES TYPICALLY REQUIRED ON ONE OR BOTH SIDES OF A PRV/NRV/FLOWMETER. REQUIRED ON BOTH SIDES IF BOTH SIDES UNDER PRESSURE DURING REMOVAL. ISOLATION VALVES TYPICALLY BURIED EXTERNAL TO THE PIT (UNLESS STATED OTHERWISE (eg: SPS VALVE PIT).

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EMBEDMENT

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CEMENT STABILISED EMBEDMENT, or CONCRETE

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NATIVE SOIL

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CAST INSITU PIT SHOWN. COULD BE A PREFABRICATED PIT

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BACKFILL

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EMBEDMENT

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NATIVE SOIL

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PETROLATUM TAPE CORROSION PROTECTION SYSTEM

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CAST INSITU PIT SHOWN. COULD BE A PREFABRICATED PIT

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1.5H or WITHIN PIT REINFORCEMENT

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CHEMSET ANCHOURS

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COMPO (REFER MRWA-S-500, TABLE 500-B)

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THIS ARRANGEMENT IS ACCEPTABLE WHERE THE CROSS SECTIONAL AREA OF THE PIT END WALL IS GREATER THAN OR EQUAL TO THE REQUIRED THRUST RESTRAINT AREA

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H

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FLEXIBLE PIPELINES (eg: MS, DI, PVC, PP AND PE) DO NOT REQUIRE BURIED ROCKER PIPES (SHORT FLEXIBLE PIPE SEGMENTS) ADJACENT TO PIT ENTRY AND EXIT POINTS. GRP PIPES REQUIRE ROCKER PIPES AS INDICATED IN MRWA-S-310, FIGURE 310-G.

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CONCRETE THRUST RESTRAINT

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EMBEDMENT

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PUDDLE FLANGE

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NATIVE SOIL

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NATIVE SOIL

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EXPOSED AGGREGATE SURFACE

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THIS ARRANGEMENT IS REQUIRED WHERE THE CROSS SECTIONAL AREA OF THE PIT END WALL IS LESS THAN THE REQUIRED THRUST RESTRAINT AREA

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PREFABRICATED PIT SHOWN. COULD BE A CAST INSITU PIT

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THIS ARRANGEMENT IS ACCEPTABLE WHERE THE CROSS SECTIONAL AREA OF THE PIT END WALL IS GREATER THAN OR EQUAL TO THE REQUIRED THRUST RESTRAINT AREA

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REFER TO MRWA-S-310, FIG. 310-D TO 310-G

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2mm HYDROPHILIC RUBBER BANDAGE AROUND PIPE

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BACKFILL

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PUDDLE FLANGE

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BACKFILL

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EMBEDMENT

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A

B

C

D

E

F

G

A

B

C

D

E

F

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9 10 11 125 6 7 82 3 41

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SCALE:

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COPYRIGHT

JOB NoDESCRIPTION



MELWAY REF:

DATUM:

SHEET SIZE: A1

DES.

REVIEW

PM.

APP'D

DATE

SOUTH EAST WATER


ACCESS REQUIREMENTS

AND CABLE & HYDRAULIC LINE PLACEMENT

NA

AM2884- SHEET 4 B

NTS

NA

NA

.

.

.


.

TABLE C: HORIZONTAL CLEARANCES WITHIN PITSDISTANCE FROM ... DISTANCE TO ... NOMINAL CLEARANCE

TABLE D: VERTICAL CLEARANCES WITHIN PITSDISTANCE FROM ... DISTANCE TO ... NOMINAL CLEARANCE

CLEARANCE NOTES:·

·

TABLE B: ACCESS ALTERNATIVES TO BOTH SIDES OF PIPESOPTION OPTION DESCRIPTION TYPICAL SITUATIONS OF USE

SHEET 5

EXAMPLES


B

TABLE A: PIT DEPTH, WIDTH AND MATCHING COVER OPTIONSOPTION PIT HEIGHT COVER OPTION TYPICAL SITUATION SHEET 5 EXAMPLES

ELECTRICAL & HYDRAULIC LINE CONNECTIONS:

FIGURE 5: ELECTRICAL OR HYDRAULIC LINE MOUNTING

FULL WIDTH COVERS SYSTEMS PREFERRED:

CABLE & HYDRAULIC LINE PLACEMENT

ACCESS REQUIREMENTS

R. JAGGER

OCT 21

R. JAGGER

OCT 21

OCT 21

M. LOWE

C. PAXMAN

J. STREETJ. TULLY

C. PAXMAN

OCT 21

OCT 21OCT 21

OCT 21

JUN 21

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CAD FILE NAME:

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PIPEWORK OR FITTING <DN300<DN300DN300

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SIDE WALL

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400

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PIPEWORK OR FITTING >DN375>DN375DN375

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SIDE WALL

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600

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HIGH MAINTENANCE FITTING PLAN OUTLINE

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COVERED OPENING PLAN OUTLINE (WITH SUPPORT BEAMS IN PLACE)

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100

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< DN200 FITTING ie: FLANGE

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END WALL

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200

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> DN225 FITTING ie: FLANGE

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END WALL

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300

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< DN200 FITTING ie: FLANGE

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LADDER

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200

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> DN225 FITTING ie: FLANGE

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LADDER

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300

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FRONT OF LADDER

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ANY OBJECT

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750 X 750 FREE WORK SPACE REQUIRED IN FRONT OF LADDER

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PIPEWORK OR FITTING >DN375>DN375DN375

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END WALL ADJACENT TO STRADDLE LOCATION

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600

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PIPEWORK OR FITTING

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ADJACENT PARALLEL PIPEWORK OR FITTING

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750

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PIPEWORK OR FITTING (ie: FLANGE OD)

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FLOOR, CEILING OR COVER

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300

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TOP OF PIPE DESIGNED TO BE STRADDLED

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STANDING LEVEL

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600

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UNDERNEATH OF CEILING

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STANDING LEVEL

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2000

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OPERABLE VALVE HANDLE

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STANDING LEVEL

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1100 to 1200

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"STANDING LEVEL" COULD BE FROM STEP OR FLOOR LEVEL. THE CLEARANCES PROVIDED ARE NOMINAL. DESIGNER SHALL ENSURE WORKERS CAN SAFELY ACCESS ALL ITEMS AND HAVE ADEQUATE CLEAR SPACE TO ADJUST FASTENERS USING MOST APPROPRIATE TOOL(S) (eg: TORQUE WRENCH, RATTLE GUN, SPANNER etc).

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1

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LEAN OVER OR STRADDLE OVER PIPE FROM LADDER ACCESS SIDE OF PIPE

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PIPES DN300 WHERE TOP OF PIPE IS 600 ABOVE LOWEST < DN300 WHERE TOP OF PIPE IS 600 ABOVE LOWEST < 600 ABOVE LOWEST FLOOR LEVEL

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FIGURES 1 & 2

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2

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STRADDLE OVER PIPE FROM LADDER ACCESS SIDE OF PIPE, USING A STEP UP AT THE PIT END OPPOSITE THE LADDER

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PIPES BETWEEN AND INCLUDING DN375 TO DN600, WHERE TOP OF PIPE IS 600 ABOVE THE FLOOR OR STEP LEVEL < 600 ABOVE THE FLOOR OR STEP LEVEL

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FIGURE 3

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3

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PROVIDE LADDER ACCESS TO BOTH SIDES OF ALL PIPES

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PIPES DN375 WHERE TOP OF PIPE IS >600 ABOVE THE TOP OF > DN375 WHERE TOP OF PIPE IS >600 ABOVE THE TOP OF FLOOR OR STEP LEVEL

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FIGURE 4

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1

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AS SHALLOW AS PRACTICAL

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FULL WIDTH COVERS CAN BE EMPLOYED

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- MINIMUM COVER OF THE TRANSFER MAIN IS PROVIDED, & - PIT IS NARROW ENOUGH TO BE SPANNED BY COVER(S), ie: NO COVER SUPPORT , ie: NO COVER SUPPORT BEAMS REQUIRED. FOR TRAFFICABLE DUCTILE IRON COVER SYSTEMS, TYPICALLY PITS FOR DN200 APPERTENANCES CAN HAVE FULL WIDTH COVERS< DN200 APPERTENANCES CAN HAVE FULL WIDTH COVERS

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FIGURES 1 AND 2

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2

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STANDING HEIGHT WITHIN PIT 2m > 2m

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COVER SUPPORT BEAMS &/OR CEILING IS REQUIRED

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- FULL WIDTH COVERS IMPRACTICAL, & - DEEPENING THE TRANSFER MAIN IS PRACTICAL (ie: WILL NOT DIMINISH HYDRAULIC OUTCOMES BY CREATING ADDITIONAL UNDESIRABLE HIGH POINTS)

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FIGURES 3 & 4

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3. DISPENSATION REQUIRED

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AS SHALLOW AS PRACTICAL. STANDING HEIGHT WITHIN PIT <2m

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COVER SUPPORT BEAMS REQUIRED. (ie: FULL WIDTH COVERS NOT PRACTICAL). (NOTE: CEILING NOT ACCEPTABLE).

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WHERE NEITHER OPTION 1 OR 2 ARE PRACTICAL. TYPICALLY WHEN: - THE PIT NEEDS TO BE LARGER (OPENING WIDTH CAN ONLY BE > 900), AND - THE PIT CAN ONLY BE TRAFFICABLE (ie: DUCTILE IRON COVERS REQUIRED), AND - THE TRANSFER MAIN CANNOT PRACTICALLY BE DEEPENED

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NONE SHOWN

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1. MINIMISE BURIED CONDUIT DEPTH WHILE PROVIDING MINIMUM COVER. MINIMISE BURIED CONDUIT DEPTH WHILE PROVIDING MINIMUM COVER. REFER TO AS 3000 FOR MINIMUM COVER OF ELECTRICAL CABLES. REFER TO MRWA-W-202 FOR MINIMUM COVER OF HYDRAULIC LINES. 2. CONDUITS SHOULD ENTER PIT CLOSE TO WHERE CABLE / TUBE CONDUITS SHOULD ENTER PIT CLOSE TO WHERE CABLE / TUBE TERMINATES WITHIN THE PIT. 3. MINIMISE BURIED CONDUIT BENDS. MINIMISE BURIED CONDUIT BENDS. 4. UTILISE LONG RADIUS BENDS FOR DEFLECTING CONDUIT. UTILISE LONG RADIUS BENDS FOR DEFLECTING CONDUIT. 5. WITHIN THE PIT, MOUNT CABLES OR HYDRAULIC LINES ON CABLE WITHIN THE PIT, MOUNT CABLES OR HYDRAULIC LINES ON CABLE MOUNTING TRAY. CABLE MOUNTING TRAY SHOULD BE ACCESSIBLE FROM STANDING POSITION. REFER AM2714 ELECTRICAL EQUIPMENT SELECTION & INSTALLATION. 6. ELECTRICAL EQUIPMENT IN PITS SHOULD BE RATED TO IP66. ELECTRICAL EQUIPMENT IN PITS SHOULD BE RATED TO IP66. 7. WHERE REMOTE TRANSMITTER / GAUGE OPTION AVAILABLE FOR ANY WHERE REMOTE TRANSMITTER / GAUGE OPTION AVAILABLE FOR ANY PIT MOUNTED TRANSDUCERS, REMOTE TRANSMITTER / GAUGE SHALL BE LOCATED IN SWITCHBOARD OR WET PANEL CABINET OR BUILDING. 8. THE DESIGNER SHALL PROVIDE A DIMENSIONED OUTLINE OF ALL THE DESIGNER SHALL PROVIDE A DIMENSIONED OUTLINE OF ALL CABLE / TUBE MOUNTING TRAY WITHIN THE PIT DRAWINGS (TO ENSURE CLEARANCES FROM CABLE TRAY ARE MET).

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ELECTRICAL BOARD OR WET PANEL CABINET

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BURIED CONDUIT

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ITEMS WITH HYDRAULIC LINES OR ELECTRICAL CABLE

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CABLE / TUBE MOUNTING TRAY

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PIT WALL

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TYPICAL LIGHTING (IF REQUIRED)

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A. SHEET 5 FIGURES 1, 2 AND 4 ARE BASED ON FULL WIDTH COVER SYSTEMS. SHEET 5 FIGURES 1, 2 AND 4 ARE BASED ON FULL WIDTH COVER SYSTEMS. B. FULL WIDTH COVER SYSTEM OPTIONS TYPICALLY INCLUDE: FULL WIDTH COVER SYSTEM OPTIONS TYPICALLY INCLUDE: B.A. ALUMINUM COVERS (NON-TRAFFICABLE LOCATIONS) ALUMINUM COVERS (NON-TRAFFICABLE LOCATIONS) B.B. SINGLE ROW MULTI-PART DUCTILE IRON COVERS (TRAFFICABLE LOCATIONS), TYPICALLY WITH COVERS WHICH SINGLE ROW MULTI-PART DUCTILE IRON COVERS (TRAFFICABLE LOCATIONS), TYPICALLY WITH COVERS WHICH ARE 900 LONG (THE ROW WIDTH) AND MULTIPLES OF 450, 600 OR 750 WIDE. SMALLER AND LIGHTER COVERS PREFERRED WHERE PRACTICAL. C. FULL WIDTH COVER SYSTEMS ARE PREFERRED AND SHALL BE USED WHERE PRACTICAL BECAUSE: FULL WIDTH COVER SYSTEMS ARE PREFERRED AND SHALL BE USED WHERE PRACTICAL BECAUSE: C.A. THEY DO NOT REQUIRE COVER SUPPORT BEAMS OR CEILING AND SO ENABLE SHALLOW PITS < 2m IN HEIGHT. THEY DO NOT REQUIRE COVER SUPPORT BEAMS OR CEILING AND SO ENABLE SHALLOW PITS < 2m IN HEIGHT. C.B. THEY TYPICALLY ENABLE MORE ECONOMIC SMALLER FOOTPRINT PITS AS HORIZONTAL CLEARANCE FROM THEY TYPICALLY ENABLE MORE ECONOMIC SMALLER FOOTPRINT PITS AS HORIZONTAL CLEARANCE FROM COVER SUPPORT BEAMS TO LADDERS AND EQUIPMENT IS NOT REQUIRED. D. MULTIPLE ROW GROUND LEVEL COVER SYSTEMS SHALL BE AVOIDED WHERE PRACTICAL, ESPECIALLY WHERE PIT MULTIPLE ROW GROUND LEVEL COVER SYSTEMS SHALL BE AVOIDED WHERE PRACTICAL, ESPECIALLY WHERE PIT HEIGHT IS < 2m. SOUTH EAST WATER APPROVAL WOULD BE REQUIRED FOR MULTI-ROW COVER SYSTEMS USED IN CONJUNCTION WITH PITS WHICH HAVE A STANDING HEIGHT < 2m.

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HEIGHT OPTIONS LISTED IN ORDER OF PREFERENCE

FIGURE 3A: ONE LADDER & PIPE STRADDLING> DN375 & < DN600 MAINS. FLOOR LEVEL LAYOUT

A

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SCALE:

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COPYRIGHT

JOB NoDESCRIPTION



MELWAY REF:

DATUM:

SHEET SIZE: A1

DES.

REVIEW

PM.

APP'D

DATE

SOUTH EAST WATER


PIT DESIGN EXAMPLES

NA

AM2884- SHEET 5 B

NTS

NA

NA

.

.

.


.

FIGURE 4A: THREE LADDER ACCESS (> DN375 MAINS). FLOOR LEVEL LAYOUT-

2B

FIGURE 1A: SMALLER SINGLE MAIN ARRANGEMENT < DN300 MAINS. FLOOR LEVEL LAYOUT

-

1C

-

4C

UNDERSIDE OF COVERS

FIGURE 3D: ONE LADDER & PIPE STRADDLING> DN375 & < DN600 MAINS (SECTION)

FIGURE 2A: SMALLER DUAL MAIN ARRANGEMENT< DN300 MAINS. FLOOR LEVEL & COVER LAYOUT. FULL WIDTH COVERS

FIGURE 2B: SMALLER DUAL MAIN ARRANGEMENT< DN300 MAINS (SECTION)

FIGURE 4C: THREE LADDER ACCESS> DN375 MAINS (SECTION)


B

FIGURE 1B: SMALLER SINGLE MAIN ARRANGEMENT< DN300 MAINS. COVER LEVEL. FULL WIDTH COVERS

UNDERSIDE OF COVER OR COVER SUPPORT BEAM

FIGURE 3C: ONE LADDER & PIPE STRADDLING> DN375 & < DN600 MAINS. COVER LEVEL WITH MULTIPLE OPENINGS

FIGURE 4B: THREE LADDER ACCESS (> DN375 MAINS).COVER LEVEL LAYOUT WITH FULL WIDTH COVERS

-

4C

FIGURE 1C: SMALLER SINGLE MAIN ARRANGEMENT< DN300 MAINS (SECTION)

-

1C

FIGURE 3B: ONE LADDER & PIPE STRADDLING.> DN375 & < DN600 MAINS. COVER LEVEL WITH COVER SUPPORT BEAMS

DESIGN DRAWING REQUIREMENTS:

·

·

·

-

3D

R. JAGGER

OCT 21

R. JAGGER

OCT 21

OCT 21

M. LOWE

C. PAXMAN

J. STREETJ. TULLY

C. PAXMAN

OCT 21

OCT 21OCT 21

OCT 21

JUN 21

AutoCAD SHX Text

Multiples of 450, 600 or 750 (Max typ 5m (class D) or 7m (class B)) (Max typ 5m (class D) or 7m (class B))

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>100

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>100

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PREFERRED ACCESS OPENING ENCOMPASSES FULL FOOTPRINT OF PIT (UNLESS > 2.0m FROM FLOOR TO CEILING)

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>100

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>300

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>200 ( DN200) < DN200) >300 ( DN225)> DN225)

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>400

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CAD FILE NAME:

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METER / VALVE

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METER / VALVE

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METER / VALVE

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METER / VALVE

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>300

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PIT WALL

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300

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>400

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METER / VALVE

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METER / VALVE

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>600

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<600

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<600

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STEP

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<300

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STEPS MAY BE FABRICATED FROM ANY SUITABLE CORROSION RESISTANT MATERIALS

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PIT WALL

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750x750 LADDER WORKING SPACE

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METER / VALVE

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IN THIS INSTANCE FLOOR AND COVER LAYOUTS ARE SHOWN IN ONE FIGURE. THIS WOULD NOT ACCEPTABLE IN A DESIGN AS THERE WOULD TYPICALLY BE INSUFFICIENT CLARITY IF ALL REQUIRED DETAILS WERE INDICATED ON ONE PLAN

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>2000

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METER / VALVE

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STEP

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PIT WALL

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STEP

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STEP

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>300

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STEP

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STEP

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SINGLE ROW TRAFFICABLE DUCTILE IRON COVERS INDICATED. WOULD NOT BE PERMITTED WHERE STANDING HEIGHT IS <2m. OPENINGS MUST BE ADEQUATE TO ENABLE EMERGENCY RESCUE FROM ANYWHERE IN THE PIT.

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METER / VALVE

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METER / VALVE

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PIT WALL

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HINGED EDGE (IF ALUMINIUM COVERS)

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>750

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>750

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>750

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CEILING

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CEILING

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CEILING

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>100

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>100

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METER / VALVE

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300

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<600

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COVER SUPPORT BEAM NOT ALLOWED TO ENCROACH ON LADDER WORKING SPACE

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METER / VALVE

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900

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TYPICALLY 2 x 450, 600 OR 1 x 750

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>300

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MINIMUM EXTENT OF OPENING

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METER / VALVE

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STEP

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PIT WALL

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750

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900

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750

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600

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METER / VALVE

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STEP

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STEP

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FIGURE 3C COVER SYSTEM SHOWN

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COVER SUPPORT BEAM

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PREFERRED ACCESS OPENING ENCOMPASSES FULL FOOTPRINT OF PIT (UNLESS > 2.0m FROM FLOOR TO CEILING)

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STEP

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STEP

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STEP

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1. PLAN AT FLOOR LEVEL, INDICATING WALL AND SUMP DIMENSIONS AND PLAN AT FLOOR LEVEL, INDICATING WALL AND SUMP DIMENSIONS AND DIMENSIONS FROM PIPE AND FITTINGS TO PIT WALLS AND LADDER(S). 2. PLAN AT COVER LEVEL, INDICATING OPENING OUTLINES AND PLAN AT COVER LEVEL, INDICATING OPENING OUTLINES AND DIMENSIONS OF ALL COVERS, ANY LIFTING ORDER, ALL HINGED EDGES AND LOCK LOCATIONS. 3. SECTION / ELEVATION THROUGH THE PIT, INDICATING HEIGHTS AND SECTION / ELEVATION THROUGH THE PIT, INDICATING HEIGHTS AND VERTICAL CLEARANCES. WALL OUTLINES SHALL MEET THE CLEARANCE REQUIREMENTS AT BOTH FLOOR LEVEL AND COVER LEVEL, WITH BOTH FLOOR AND COVER LEVEL PLANS BEING DESIGNED CONCURRENTLY. INDICATE COVER OUTLINES IN RED. INDICATE HINGED EDGES IN BLUE RED. INDICATE HINGED EDGES IN BLUE . INDICATE HINGED EDGES IN BLUE BLUE INDICATE THE LOCATION AND DIMENSIONS OF ALL CABLE TRAY. NOMINALLY SHOW CABLE TRAY AND CONTENTS AS 50 THICK.

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>200 ( DN200) < DN200) >300 ( DN225)> DN225)

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>200 ( DN200) < DN200) >300 ( DN225)> DN225)

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TRAFFICABLE DUCTILE IRON COVERS INDICATED. THIS EXAMPLE MAY BE ACCEPTABLE IF THE PIT HEIGHT IS < 2m IF THERE IS NO ALTERNATIVE AND SEW APPROVAL IS OBTAINED. DEPENDING ON THE METER / VALVE OUTSIDE DIMENSIONS, > DN450 ITEMS MAY NOT FIT WITHIN THE MAXIMUM ACCEPTABLE 900 WIDE ROW.

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THIS EXAMPLE RELATES TO NON-TRAFFICABLE ALUMINUM COVERS, AS THE COVER LENGTH WOULD ALMOST CERTAINLY EXCEED THE MAXIMUM ALLOWABLE 900 LENGTH OF DUCTILE IRON COVERS.

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POSSIBLE LADDER LOCATION

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>750

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LADDER OPTION A

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LADDER OPTION B

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LADDER OPTION A IN FIGURE 3C SHOWN

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>300

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TRAFFICABLE DUCTILE IRON COVERS INDICATED

am2884 pit standard - southeastwater.com.au

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